Permanent magnet generator

ABSTRACT

The present invention relates to a permanent magnet generator for increasing the capacity of generating the electric power by increasing the number of a magnetic pole. Thus, the present invention is constructed to largely increase the capacity of generating the electric power by installing the ferromagnetic substances, which are magnetized due to permanent magnets disposed at the rotor, between the permanent magnets thereby easily increasing the number of the magnetic poles twice.

TECHNICAL FIELD

The present invention relates to a permanent magnet generator, and moreparticularly, to a permanent magnet generator, which has ferromagneticsubstances for increasing the number of the magnetic poles of the rotormore than twice so as to improve the capacity of generated electricpower.

BACKGROUND ART

In general, a permanent magnet generator is a generator, which obtainsnecessary magnetic flux by using a permanent magnet, and has advantagesthat it has a higher efficiency than a winding type generator, and canbe minimized.

However, as it was constructed to directly install a magnetic pole tothe rotor, it was very difficult to install or separate the magneticpole from the rotor because of the repulsion force or the suctioningforce produced between the magnetic poles. Also, as the magnetic poleshould be machined to form a round shape due to the structure of therotor, a problem occurred that a magnet for constituting a roundmagnetic pole is expensive.

In addition, it is required to manufacture the magnet to be larger toincrease the capacity of generating the electric power, however, it isineffective because a large quantity of energy is required to magnetizethe large magnet.

Moreover, when the generation of the electric power is required at aplace where the rotation movement is small, the electricity is obtainedby subjecting a generator with a few magnetic poles to a chain or agear, and the like, however, it was difficult to obtain desired quantityof generation of the electric power, because a loss at a powertransmission device for driving the generator was high.

This problem could be easily understood by the consideration of casessuch as manpower or a wind generator, and the like, in which outputenergy is less than input energy.

Accordingly, it is required to increase frequency (f), or a windingnumber (N), or magnetic flux (φ) in a voltage equation as denoted byV=4.44 f Nφ[V] so as to increase the voltage of the generator. However,when the rotation for the generation of the electric power becomessmaller, the frequency becomes smaller so that it is required toincrease the winding number (N) or the magnetic flux (φ), then, when thewinding number (N) becomes more, resistance or reluctance becomeslarger, thereby increasing the voltage reduction, so that it isnecessary to increase the magnetic flux (φ).

Thus, it is required to make the magnet large to increase the magneticflux while the magnet made of rare-earth substance is used. In thisregard, when the magnet becomes large, several problems can be occurredin the treatment of the magnet. In other words, as described above, asthe magnet becomes larger, more magnetic energy will be consumed, and itbecomes more difficult to separate the magnets after they are adhered,as the suctioning force produced between the magnets becomes smaller dueto their large size. As a result, it is preferable to transport themagnets after installing them to the rotor. However, it is difficult toinstall the magnets at the rotor in such a manner as to be spaced apartfrom each other by a predetermined interval, and it becomes alsodifficult to install the magnets in such a manner as to be spaced apartfrom each other by a predetermined interval during the manufacturing ofthe generator.

DISCLOSURE OF INVENTION Technical Problem

Accordingly, the present invention was devised to solve suchconventional problems, and an object of the present invention is toprovide a permanent magnet generator, which can install ferromagneticsubstances having an easily magnetizing property between the permanentmagnets to increase the number of the magnetic poles, which is installedat the rotor, thereby producing larger electric power to accomplish aneconomic efficiency.

Technical Solution

To achieve the above object, the present invention provides a permanentmagnet generator comprising: a rotor constructed by installing permanentmagnets at an outer peripheral edge thereof in such a manner as to bespaced apart from each other by a predetermined interval so thatidentical magnetic poles of the permanent magnets face each other;ferromagnetic substances, each of which is made of magnetizing metalsubstance and installed between the permanent magnets of the rotor sothat they can be magnetized to be the same magnetic poles as those ofthe permanent magnets; and a stator constructed to enclose the rotor bywinding coils for inducting electric current between the ferromagneticsubstances and the permanent magnets.

In addition, the permanent magnet generator of the present invention ischaracterized in that non-magnetic substances are installed in the axialdirection of the rotor, and the permanent magnets are arranged on thenon-magnetic substances in series along the axial direction of therotor.

Also, the permanent magnet generator of the present invention ischaracterized by further including a rotation means for rotating therotor.

Moreover, the permanent magnet generator of the present invention ischaracterized in that the rotation means is a pedal installed at a shaftof the rotor so that it can be treaded with feet.

In addition, the permanent magnet generator of the present invention ischaracterized in that the stator is provided with a battery foraccumulating the electricity produced from the coils.

Advantageous Effects

Therefore, according to the permanent magnet generator of the presentinvention, it is possible to obtain an advantage of achieving theeconomic efficiency of obtaining larger capacity of generating theelectric power by the structure of increasing the number of the magneticpoles more than twice because magnetized ferromagnetic substances areinstalled between the permanent magnets disposed at the rotor.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing a portion of a permanent magnetgenerator according to an embodiment of the present invention;

FIG. 2 is a schematic view showing only a portion of the permanentmagnet generator according to another embodiment of the presentinvention;

FIG. 3 is a schematic view showing a portion of the permanent magnetgenerator according to still another embodiment of the presentinvention;

FIG. 4 is a view schematically showing an arrangement of magnetsaccording to still another embodiment of the present invention;

FIG. 5 is a view showing a use example of the permanent magnet generatoraccording to the present invention; and

FIG. 6 is a view showing another use example of FIG. 5.

MODE FOR THE INVENTION

Hereinafter, the preferred embodiment of the present invention will bedescribed in detail with reference to the appended drawings.

FIG. 1 is a schematic view showing a portion of a permanent magnetgenerator according to an embodiment of the present invention. As shownin FIG. 1, the permanent magnet generator according to the presentinvention comprises a stator 10 wound with coils (not shown) and a rotor20.

The stator 10 is shown as formed with a plurality of slots 11 at aninner peripheral edge with a predetermined interval so that coils can bewound around it through the slots 11, however, the stator 10 can bewound with the coils by using a magnetic induction core, differentlyfrom this case.

Thus, the rotor 20 is installed at the inside of the stator 10, and aplurality of magnets 21 a, 21 b, 21 c are installed at an outerperipheral edge.

In addition, a plurality of ferromagnetic substances 31 a, 31 b, 31 c,31 d, 31 e, 31 d, 31 f is installed between the permanent magnets 21 a,21 b, 21 c so that they are magnetized to form new magnetic poles. Thepermanent magnets 21 a, 21 b, 21 c are installed in a predeterminedinterval so that identical magnetic pole can be opposite to each other.As a result, the ferromagnetic substances 31 a, 31 b, 31 c, 31 d, 31 e,31 f are magnetized to be the same polarities as those of the permanentmagnets to form new magnetic poles.

More concretely speaking, at first, the ferromagnetic substances 31 a,31 b, 31 c, 31 d are installed at the outer peripheral edge of the rotor20 with a predetermined interval. Then, the permanent magnet 21 a andthe permanent magnet 21 c are installed by being inserted between theferromagnetic substance 31 a and the ferromagnetic substance 31 b, andbetween the ferromagnetic substance 31 e and the ferromagnetic substance31 f with the N pole directing toward the left side, without insertingany ferromagnetic substance between the ferromagnetic substance 31 c andthe ferromagnetic substance 31 d. Then, the ferromagnetic substances 31a, 31 e positioned at the left side with interposing the permanentmagnets 21 a, 21 c are magnetized to be N poles by the effect of the Npoles of the permanent magnets 21 a, 21 c, and the ferromagneticsubstances 31 b, 31 f positioned at the right side are magnetized to beS poles by the effect of the S poles of the permanent magnets 21 a, 21c.

In this instance, when the permanent magnet 21 b is inserted between theferromagnetic substance 31 c and the ferromagnetic substance 31 d withthe S pole facing toward the left side, the ferromagnetic substances 31a, 31 b, 31 c, 31 d are magnetized to be the same polarities as those ofthe left and right sides of the permanent magnets 21 a, 21 b, 21 cthereby forming new magnetic poles.

While repulsion force is produced due to the ferromagnetic substance 31b magnetized to be the S pole and the ferromagnetic substance 31 emagnetized to be the N pole, when the permanent magnet 21 b is insertedbetween the ferromagnetic substance 31 c and the ferromagnetic substance31 d, it was not difficult to assembly the permanent magnets because therepulsion force produced between the ferromagnetic substances at thistime is less than that produced between the permanent magnets. Thus,while it is almost impossible to assemble magnets themselves so thatidentical magnetic poles face each other, it can be easily assembled bydisposing the ferromagnetic substances 31 a, 31 b, 31 c, 31 d, 31 e, 31f as mediums. As a result, it is possible to obtain high voltage at lowspeed, because a flux density on the pole increases by the assembly.

The stator 10 generates electric power according to the Lenz s Law andthe Fleming s Law through the interaction between the ferromagneticsubstances 31 a, 31 b, 31 c, 31 d, 31 e, 31 f magnetized by the rotationof the rotor 20 and the permanent magnets 21 a, 21 b, 21 c.

Accordingly, the number of magnetic poles was conventionally decidedbased on the number of the magnets, however, the number of magneticpoles are decided based on twice the number of the magnets according tothe present invention because all of the two magnetic poles of themagnets become to be the number of the magnetic poles, so that frequencyis increased to be twice thereby producing larger electric power.

According to the structure of the present invention as described above,it is possible to easily increase the capacity of generating theelectric power by only increasing the number of the magnets andinserting the ferromagnetic substances into the slots of the rotorthereby lengthening the length of the rotor to achieve the increase ofthe magnetic flux.

Also, since the magnet can be manufactured to be a stick shape accordingto the present invention, the manufacturing cost of the product can bereduced. In addition, while the magnetic reduction of the magnet isproduced due to outer accident, since it can be complemented by themagnetic poles (i.e., magnetized ferromagnetic substance), the effect ofthe magnetic reduction of the magnet itself becomes very little.

Moreover, it is preferable to connect a battery (not shown) to coils ofthe stator 10 to accumulate the electric power. The battery accumulatesthe electric power produced at the coils of the stator 10 and it issupplied stably to the use place. The accumulated electricity istransformed into DC or AC so that it can be used house-hold electricdevices, and the like.

FIG. 2 is a view schematically showing a portion of the permanent magnetgenerator according to another embodiment of the present invention, inwhich identical numerals are denoted for the identical portions so as toavoid repeated explanations.

As shown in FIG. 2, it should be known that identical effect could beobtained with that of the embodiment shown in FIG. 1, because twice themagnetic pole number can be obtained, while the permanent magnets 121 a,121 b, 121 c are installed between the ferromagnetic substances 131 a,131 b, 131 c, 131 d of the rotor 120 with skipping over theferromagnetic substance.

For instance, when the permanent magnets 121 a, 121 b are installedbetween the ferromagnetic substance 131 a and the ferromagneticsubstance 131 b, and between the ferromagnetic substance 131 c and theferromagnetic substance 131 d, without installing a permanent magnetbetween the ferromagnetic substance 131 b and the ferromagneticsubstance 131 c, twice the magnetic pole number is obtained to therebyachieve identical effect with that of the embodiment, because theferromagnetic substance 131 b and the ferromagnetic substance 131 c aremagnetized to be the S pole and the N pole due to the permanent magnets121 a, 121 b positioned adjacently in the right and left directions.

FIG. 3 is a schematic view showing a portion of the permanent magnetgenerator according to another embodiment of the present invention, andFIG. 4 is also a schematic view showing a permanent magnet generatoraccording to another embodiment of the present invention, in which themagnet arrangement is schematically shown.

As shown in FIGS. 3 and 4, when a non-magnetic substance 240 is disposedat the axial direction of the rotor 220, and permanent magnets 221 a,221 b, 221 c of the same direction are disposed in series along theaxial direction between the ferromagnetic substances 231 a, 231 b, 231c, 231 d, the assembly work becomes easier as the repulsion forcebetween the permanent magnets 221 a, 221 b, 221 c become small. Theaction and effect of the above embodiment are the same as those of theabove embodiment.

FIG. 5 is a view showing a use example of the permanent magnet generatoraccording to the present invention. As shown in FIG. 5, the presentinvention can be applied to a bicycle type rotation means 40, 140, whichis a kind of an exercising device so that required electric power can beproduced.

In other words, when the stator 10 and the rotor 20, 120 are coveredwith a case 41 so that only a rotation shaft 27, 127 of the rotor 20,120 is exposed, a sprocket 43 is installed to the exposed rotation shaft27, 127, and the sprocket 43 is connected to a sprocket 48 with a pedal45 by means of a chain 47, then, the rotor 20, 120 is adapted to bedriven according to the treading movement of the pedal 45 by a user, whois sit on a saddle 48, so that electric power can be generated. Thegeneration of the electric power can provide two simultaneous effectssuch that the users can exercise and obtain the electricity at the sametime. The drawing numeral 49 represents a frame of the rotation means40.

In addition, it is possible to produce necessary electricity byconstructing that a handle knob is installed at the rotation shaft ofthe rotor 20, 120 so that the user can rotate the rotation shaft withgrasping the handle knob, differently from the above embodiments.

FIG. 6 is a view showing another use example of FIG. 5. As shown in FIG.6, it is constructed that the stator 10 and the rotor 20, 120 arecovered with a case 141 so that rotation shaft 27, 127 of the rotor 20,120 is exposed, and a pedal 145 is directly installed to the exposedrotation shaft 27, 127, and the pedal 145 is treaded by the user sit onthe saddle thereby rotating the rotor 20, 120 so that electricity can begenerated.

INDUSTRIAL APPLICABILITY

As described above, according to the present invention, it is possibleto obtain an advantage of achieving the economic efficiency of obtaininglarger capacity of generating the electric power by the structure ofincreasing the number of the magnetic poles more than twice becausemagnetized ferromagnetic substances are installed between the permanentmagnets disposed at the rotor.

1. A permanent magnet generator comprising: a rotor constructed byinstalling permanent magnets at an outer peripheral edge thereof whilebeing spaced apart from each other by a predetermined interval so thatidentical magnetic poles of the permanent magnets face each other;ferromagnetic substances, each of which is made of magnetizing metalsubstance and installed between the permanent magnets of the rotor sothat they can be magnetized to be the same magnetic poles as those ofthe permanent magnets; and a stator constructed to enclose the rotor bywinding coils for inducting electric current between the ferromagneticsubstances and the permanent magnets.
 2. The permanent magnet generatoraccording to claim 1, wherein non-magnetic substances are installed inthe axial direction of the rotor, and the permanent magnets are arrangedon the non-magnetic substances in series along the axial direction ofthe rotor.
 3. The permanent magnet generator according to claim 1,further comprises a rotation means for rotating the rotor.
 4. Thepermanent magnet generator according to claim 3, wherein the rotationmeans is a pedal installed at a shaft of the rotor so that it can betreaded with feet.
 5. The permanent magnet generator according to claim1, wherein the stator is further provided with a battery foraccumulating the electricity produced from the coils.